Foden still had a year to run on his contract at Franklin's Gardens but he will now remain at the Heineken Cup finalists until at least 2014.
The 25-year-old has become a key figure for club and country since making the switch to the Saints from Sale in 2008, with Foden scoring 20 tries in 81 appearances.
And having won the European Challenge Cup and LV= Cup while at Northampton and helped established them as one of England's top sides, Foden is targeting more success.
"I know this was where I want to be," he said. "I've seen the club climb and achieve bigger things with every season. I was pretty quick in putting pen to paper and signing for two more years.
"We've strengthened the squad during the summer. We achieved some great things last year and reached a major final, although we came up just short. But I'm excited to be here and I'm looking forward to a long future here.
"We're a young squad and have got better and better each year, which shows where the team is climbing to under the direction of Jim, Dorian and Paul. There are great things in the future of the club and hopefully I can be a part of that."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.